Air-compressor



2 Sheets-Sheet 1.

(No Model.)

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(N0. Model.) 2 Sheets-Sheet 2.

P. WEISBL.

A1B COMPRESSOR.

No. 467,389. Patented Jan. 1Q, 1892.

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ATTORNEY 'ma Nnnms'Pa-rsns mi, moro-umn., wAsHmGwu, o. c.

UNITED STATES PATENT OFFICE.

PETER lVEISEL, OF MILVAUKEE, VISCONSIN,

AIR-COMPRESSOR.

SPECIFICATION forming part of `Letters Patent No. 467,389, dated January19, 1892. Application filed February 2, 1887. Serial No. 226,331. (Nomodel.)

To a/ZZ whom t may concern.-

Be it known that I, PETER WErsE-L, of the city and county of Milwaukee,and State of lVisconsin,haveinvented certain newand useful Improvementsin Air-Compressors; and I do hereby declare that the following is afull, clear, and exact description of the invention, which will enableothers skilled in the art to which it pertains to make and use the same,

:reference being had to the accompanying' or attachment, of anoil-supply pipe or pas- 25 Y of pistons applied to the valve-stems andsage communicating with both stuffing-boxes,

Working in closed or partially-closed chambers, and of certain otherfeatures hereinafter set forth.

In the accompanying drawings like letters designate the same parts inthe-several gures.

Figure l is a vertical axial section of a portion of thecompressor-cylinder embodying my improvements. Fig. 2 is a plan view ofthe same, the cylinder being shown in medial horizontal section. Fig. 3is a cross-section on the line o: Fig. 2. Fig. A is a cross-seetion onthe line f1] y, Fig. l, showingin elevation the divided washer by whichthe sleeve or gland of one of the stuffing-boxes is operated. Fig. 5 isa sectional detail, on an enlarged scale, of a piston and its caseconstituting an air-cushion for one of the valves; and Fig. 6 is asection taken at right angles to that shown in Fig. 5 and showing amodified form of the piston employed in connection with the valves.

It is well understood by those familiar with this class of machines thatit is difficult to prevent the gas commonly employed` therein, whensubjected to the usual high pressure,

from escaping more or less through the studing-box about the piston-rodwithout causing said piston-rod to bind and Work imperfectly.

The foregoing observation is particularly true with respect to theammonia-gas cornmonly employed in refrigerating-machines.

As heretofore constructed double stuffingboxes have been so connectedthat to cornpress the packing next to the cylinder it was necessary toeffect the same by means of the gland of the outer stuffing-box, which,operating rst upon the packing therein, spent the greater part of itsforce before acting upon the packing nearest the cylinder.

To meet the foregoing difficulties is the design of the compound ordouble stuffing-box hereinafter described.

Referring to the drawings, A represents a port-ion of thecompressor-cylinder, A one of the heads of said cylinder formed with thestuffing-box L, and wells or pockets A2 for the reception of thevalve-cases N N.

D is a sleeve mounted upon the piston B and inserted at one end into thestufling-box L, of which it constitutes the gland.

E is an internally-threaded ring engaging and working with screw-threadscut in the outer face of the stufling-box L. To theouter face or side ofthe ring E is bolted the ring or washer e, which bears against anannular flange d, formed on the outside of the sleeve D. The ring orwasherc is divided, asshown in Fig. 4, to facilitate its removal oradjustment upon the sleeve D. l

C is a cylinder placed around the pistonrod B a short distance from thestuihng-box L and secured independently thereof to the frame orbed H ofthe machine. The sleeve D is extended beyond the stuffing-box. L intothe adjacent end of the cylinder C, constituting one of the glandsthereof, as shown in Fig. 1. At the opposite end the cylinder C isexternally screw-threaded to receive and engage theinternally-screW-threaded ring or cap F, which bears against and retainsthe gland or follower f in place.

G is a sleeve placed inside of the cylinder C midway between the sleeveD and gland f and formed inside and out with annular recesses, which areconnected by openings through said sleeve. Upon the cylinder C ismounted a closed oil-chamber K, connected IDO at the top by a pipe 7cwith the suction side of the compressor. By means of the valve 7a inpip@ 7c communication between the compressor and oil-chamber K may beopened or closed at will. An annular recess cl is formed in the outerface of the sleeve D at the end inserted in the cylinder C andcommunicates through an opening or openings withalarger recess formedinside of said sleeve about the piston B. Iassages c c, formed incylinder C, connect the annular recesses in the outer faces of thesleeves D and G with the lower part of the oil-chamber K.

h is a pipe connected with the under side d of cylinder C opposite therecess in the outer face of sleeve G. It is provided with a valve h3, bywhich the said pipe may be opened or closed. v

Between the cylinder C and the valve ha pipe h is connected with thepipe 72, and overhangs at its discharging end an oil-well or drip-pan I,placed underneath the outer end of said cylinder C to catch the oilwhich may escape therefrom upon the piston rod. B. The valve h2regulates the iow of oil in the pipe h and closes the same whenever itis desired to discharge the oil from the cylinder C through the pipe hfor the purpose of cleansing said cylinder, dac.

P is a pump connected by a pipe with the oil-well I and on the forceside by a pipe p with the lower part of the oil-chamber K. The pump Pmay be arranged, as shown in the drawings, to be operated automaticallyby the movement of the piston or by other suitable means, or it may bcoperated by hand.

To further insure against the escape of gas through the packing outsideof the sleeves D, I form annular recesses in the outer end of thestuffing-box L and in the adjacent end of the cylinder C and insert insaid recesses suitable packing, which is compressed and retained thereinby means of the annular threaded followers c and l. In the opening atthe inner end of the stuffing-box L, where the piston-rod B enters thecylinder A, I prenlovement, openings n2 n2, as shown in Fig. 5, may bemade in the caps inclosing the pistons on said valve-stems. As thepiston b2 (shown in Fig. 5) passes the openings n2 in either directionand approaches the ends of.

the chamber formed by the cap 1t and valvecase N, the confined air formsa cushion for said piston and prevents the valve from being violentlyseated.

In place of the openings through the caps inclosing the pistons onthe-valvestems, as described, recesses. or openings b4 may be formed, asshown in Fig. 6, in the periphery of said pistons, or said pistons maybe a little smaller than the caps or cases in which they work, so as topermit the passage of air between them and said cases and allowsufficient freedom of motion of the valves. The pistonsa2 on the stemsof the suction-valves a need to be cushioned at one end of their strokeonly, since 'in opening they work against the spring a3, and theirmovement in that direction requires no further check. In connection withthe force-valves the movement of the piston b2 in both directions shouldWasher e, which engages and Works with thev flange d upon said sleeve.The packing in stuffing-box L having been sufficiently compressed,packing is placed in the cylinder C between the sleeve G and the sleeveD and the follower f and compressed by screwing up the cap F on theouter end of said cylinl der C. The annular recesses in the outer facesof the sleeve D and sleeve G are of sufficient width to permit oftheiradj ustment in the operation of packing without moving them out ofcommunication with the oil-passages c c, through which lubricant issupplied to both sleeves D and G and to the piston-rod B.

fer to place an internally-rabbeted gland ZP/A-n-y gases escaping fromthe compressor-cylas shown in Fig. l.

To stiffen or brace the compressor-cylinder A and preserve its alignmentand adjustment with reference to the stuffing-boxes and to prevent thedeflection by the movement f the piston-rod B of either' the cylinder orthe stuffing-boxes, also to avoid 'the binding and unequal wear of thepacking and piston-rod, the outer stuffing-box Gis directly and rigidlysecured to the frame o r bed H of the machine and connected with thecompressor-cylinder A by a tie rod or bolt C2.

To prevent the percussion of the valves a. and l) with their cases andseats N N', I provide their stems a b with pistons a2 b2, which areinclosed in caps mi', secured to the valvecases N N.

To allow the valve suiiicient freedom of inder A around the piston Binto the sleeve D passes through passage cinto the chamber K, where itrises to the top of the oil therein and may be drawn therefrom throughthe pipe c back into the compressor-cylinder. Any excess of oil forcedinto the chamber K escapes from the under side of the sleeve G throughthe pipe h into the oil drip-pan I, the discharge of oil from thecylinder C being regulated by the valve h2, so as to maintain a certainlevel in the chamber K. Whenever the oil becomes dirty and it is desiredto discharge the same from chamber K and cylinder C, the valve h2 isclosed and the valve h3 opened,

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thus permitting the oil, with all the impurii made in the details ofconstruction in carrying my invention into practice without departurefrom the spirit thereof.

1. The combination, with the cylinder provided with a stufng-box, thepiston, and piston-rod, of a supporting-bed to which said cylinder isfixed and an auxiliary stuffing-box supportedindependently of saidcylinder, substantially as and for the purposes set forth.

2. The combination, with the cylinderhaving a stuffing-box formed in onehead and the piston and piston-rod, of a stuffing-box formed separatelyfrom the first-mentioned stuffingbox, and a sleeve placed around thepistonrod and inserted in the adjacent ends of said boxes and serving asglands therefor, substantially as and for the purposes set forth.

3. The combination, with the cylinder and its piston and piston-rod anda supporting bed or frame, of a stuffing-box formed in thecylinder-head, an auxiliary stuffing-box independently attached to saidbed or frame which constitutes aseparate independent su pport for saidauxiliary box a short distance from said cylinder and its stufngboxalongitudinally-adj ustable sleeve placed over thev piston-rod betweensaid stuffing-boxes and serving as glands for their adjacent ends, and agland adj ustably attached to the outer end of said auxiliarystuffing-box, substantially as and for the purposes set forth.

4. The combination, with the cylinder and its piston and piston-rod anda supporting bed or frame, of a stuffing-box formed in onecylinder-head, an auxiliary stuffing-box attached independently thereofto said frame or bed which constitutes a separate independent supportfor said auxiliary box and provided at the end opposite the cylinderwith a gland, an internally-recessed sleeve, the

ends of which form glands for the adjacent ends of said stuffing-boxes,mounted upon the piston-rod between them, and an oil-passagecommunicating with the recess in said sleeve, substantially as and forthe purposes set forth.

5. The combination, with the cylinder and its piston and piston-rod anda supporting bed or frame, of a stuiiing-box formed in onecylinder-head, an auxiliary stuffing-box independently attached to saidbed or frame which constitutes a separate independent support for saidauxiliary box, an internallyrecessed sleeve mounted upon said piston-rodand forming at the ends glands for said stuifing-boxes, an externalrecess in said sleeve within one stuffing-box and connected with theinternal recess therein, an oil-supply pas 7. The combination, with thecylinder and its piston and piston-rod and a supporting bed or frame, ofa stuffing-box formed in one cylinder-head, an auxiliary stuffing-boxattached independently thereof to said bed or frame which constitutes aseparate independent support for said auxiliary box, alongitudinallyadjustable sleeve interposed between said stufting-boxesand forming glands for the adjacent ends thereof, and a tie-rodconnecting said auxiliary stuffing-box with said cylinder, substantiallyas and for the purposes set forth.

8. The combination, with a cylinder and its piston-rod, of astuingf-box, an oil-chamber 1 mounted thereon and communicating with theinterior of said stuffing-box, a dischargepipe connected with the underside of said stuffing-box and discharging below the same, a valvearranged to open and close said. pipe, and a branch connected therewithbetween said valve and stuffing-box and provided with a valve arrangedto regulate the flow of oilY from said stuffing-box, substantially asand for the purposes set forth.

9. The combination, with a cylinder and its piston-rod, of astufiing-box, an oil-chamber mounted thereon and communicating with theinterior of said stuffing-box, a pump connected with and arranged toforce oil into said oil-chamber, a discharge-pipe connected with thelower part of said stuffing-box and furnished with a regulating-valve,and a pipe provided with a valve connecting the upper part of saidoil-chamber with said cylinder, substantially as and for the purposesset forth.

I testimony that I claim the foregoing as my own I affix my signature inpresence of two witnesses.

PETER IVEISEL. Witnesses:

Citas. L. Goss, ERNs'ruVILTER.

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